Counter for pulleys



Novo 24, G. LAURIN COUNTER FOR PULLEYS Filed Feb. 8, 1924 lamw *MMM

mvEN-roR ATTORNEY Patented Nov. 24, 1925.

UNITED STATES GERHARD LAURIN, OF EVANSTON, ILLINOIS. i

COUNTER non PULLEYs. t

Application filed Februaiy 8, 1924. Serial No. 091,452.`

To all w/zom it '11m-y concern.'

Be it known that I. (i1-:mimo Immun, a naturalized. citizen of thc United States, residingr at Evanston. in the county of Cook and State of Illinois, have invented new and useful Improvement in Counters for Pulleys, of which the following is a specification.

This invention relates to new and useful improvements in counters for pulleys and more particularly to a device for ascertain ing the diameters of certain pulleys and the number of`revolutions per minute. The main object of the present invention is the provision of a counter for pulleys whereby the diameterof certain pulleys may be ascertained when the diameter and revolutions per minute is given of another pulley to which the first pulley is attached through the mediumA of a belt and also .indicate the speed of the belt between the t-wo pulleys.

Another object of the present invention is the provision of a device of the above character which can be quickly and readily operated to ascertain the belt speed between the two pulleys and also indicate the proper diameter of a pulley to be used with another pulley. the diameter and revolutions per minute of which is known in order to provide the proper sized pulleys for driving a belt at the required speed.

With the above and other objects in view the invention consists in the novel features in construction. the combination and arrangement of parts hereinafter more fully set forth, pointed out in the claim and shown in the accompanying drawings, in which z- Fig. 1 is a side elevation of a counter for pulleys constructed in accordance with my invention.

Fig. 2 is a longitudinal section. f In carrying outmy invention I provide a holder or support the body 1 of which is preferably elongated in form having; arcuate end portions 2 and 3, the end 3 being split longitudinally of the body to provide a receiving recess 4 for the counter disc 5. This counter` disc is positioned centrally with respect to the arcuate end 3 and mounted for rotation therein by means of the bearing pin 6, the ends of which are upset or riveted as shown at 7 for retaining the two side portions of the end 3 and the disc 5 in proper relative positions.

The disc 5 is provided at one side thereof with a plurality of graduations indicated at S, said graduations running in value from 50 to 3,000` said graduatlons indicating,l the diameters of various sized pulleys inl millimeters.

The disc 5 is also provided with a plurality of graduations 9 arranged upon the opposite side of the center of the disc 5 to the graduations 8, and these `raduations 9 are provided with numerals ranging from 3 to 30 so as to indicate the various speeds of belts between two operatiupr pulleys aud it will be apparent thatv both of the sets of graduations 8 and 9 are circumferentially arranged upon the disc 5 within a circle 10 which is positioned adjacent the arcuate perimeter of the end 3 of the holder.

with respect The body 1 of the holder is provided with a sight opening 11 and positioned substantially centrally of the sight opening at one side thereof is suitable indicating indicia 12 which cooperates with the graduations 9l to correctly indicate the number of revolutions of thc belt around two pre-determined sized pulleys.

The arcuate end 3 of the body 1 is rovided adjacent its perimeter upon one Iieee thereof with a plurality of graduations 13 which are numbered from 30 to 5,000 and are used for indicating the number of revolutions per minute of different sized pulleys.

It will be apparent that if a party desires to connect two pulleys by means of a belt and desires to have this belt travel at a pre-determined rate of speed, the counter will readily indicate the size of the second pulley which is to be used in connection with the pulley, the diameter of which is known, and in order to do this, the disc 5 is rotated relative to the arcuate end of the body 1 and if for example the diameter of the first pulley is 180 millimeters and the revolutions of this pulley per minute is 2,000, the graduation number 2,000 of the series 13 is positioned opposite 180 of the series of the graduations 8. Now if it is desired to have the second pulley revolve at a rate of 400 revolutions per minute, the required size of the pulley will be indicated opposite the number 400 in thel series 13 on the end 3, thus it will be from the foregoing 7 on the series of graduations 9, the in icat- A counter for pulleys including an elonnotedl that 900 appears on the series 8 opmanufacture of the same without departing posite 400 indicating that the second pulley from the spirit of the invention or the must be 900 millimeters in diameter. scfpe of the ap ended claim.

By positioning the disc as indicated above, aving thus ascribed my invention what /6 the rate of speed of the belt will be iven I claim 13:-

ing indicia being positioned opposite 19. gated body havin spaced arcuate end port will be apparent from the foregoing tions, one of sai end ortions forming a vthat if a party desires to have a belt travelhandle and the other enfi) portion being split 10 in at a certain rate of speed, the disc 5 and longitudinally to form a receiving recess, a 35 engi 3 will readily indicate the desired pulcounter disc 1n said recess, a, pin traversing leys to be used for imparting this rate of the center of the arcuate ends and the disc speed to the belt. For instance if it is defor rotatably mounting the disc, one of said sired to have the b'elt travel at a rate of end portions having a series of graduations 15 19 revolutions ger minute, the indicia arrow extendin inwardly from its edge, gradua- 40 12 is positione opposite `the graduation 19 ,tions on t e disc cooperating with the graduof the series 9 and the proper pulley diamations on the arcuate end portions, la seceters will appear in the graduations of the ond set of graduations on the disc opposite series 8 in accordance with the number of the first set of said body having a side open- 20 revolutions per minute of the size of pul- 'ing to display the second set of graduations 45 leys desired. on the disc at a point centrall of the body. f While `I have shown and described the In testimony whereof ,I aihx my signareferred form of my invention I wish it to ture. e understood that various chan es and al- 'fn amiens may be carried out urig the A y GERHARD LAURIN. 

